Level 17 50 Points

Level 18 50 Points

Level 19 50 Points

Level 20 50 Points

Author Comments

The microbes continue attacking! Now you'll have to face purple microbes, which are twice as clever than other alien microbes and they are very decisive to invade the Green World. Enjoy new levels of this exciting game and try to prevent alien microbes' invasion!

Not bad. The linearity of the last one is all but gone (Plus in my book) But I found this one to be a bit easier.
I also had the same problem as EpicalDude, in that I could not see any shared levels. I am also using Linux, Ubuntu 15.1
Good games though, keep em coming.